#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
    int ch = 0;
    while (scanf("%c\n", &ch) != EOF)
    {
        if (isalpha(ch))
        {
            printf("%c is an alphabet.\n", ch);
        }
        else
        {
            printf("%c is not an alphabet.\n", ch);
        }
    }
    return  0;
}